Specific cartridge loads need specific propellant to perform to their ballistic peak. That's why Alliant Powder® put countless hours of research and development into creating Reloder® 33. The advanced powder is specifically formulated for the long-range .338 Lapua, although it is also ideal for a range of large magnum rifle cartridges. Its double base gives it consistent performance across temperature and humidity extremes, and it meters well for easy and precise loading. 1 lb canister.